<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <title>Document</title>
</head>
<body>
    <div id="app">
    787445333.0h    <div :style="{width:width,height:height,backgroundColor:backgroundColor}">halo</div>
        <div :style="halo">this is 441</div>
        <button @click="click">click</button>
    </div>

    <script>
        new Vue({
            el:"#app",
            data:{
                w:100,
                h:100,
                width:"100px",
                height:"100px",
                backgroundColor:"#f1a4",
                halo:{
                    width:"100px",
                    height:"100px",
                    backgroundColor:"#1f4a"
                }
            },
            methods:{
                click(){
                    this.w += 10
                    this.width = this.w + "px"

                    this.h += 10
                    this.halo.height = this.h + "px";
                }
            }
        })
    </script>
</body>
</html>